Prepare the tenderloin: Season and sear the beef in a hot pan, then brush with Dijon mustard and let it cool to room temperature.
Make the duck cell: Cook mushrooms, shallots, garlic, whiskey, and thyme until reduced, then let it cool.
Create crepes: Whisk flour, milk, egg, and salt, cook in a pan to make crepes.
Assemble the Wellington: Layer prosciutto on crepes, spread duck cell, place beef, roll, wrap in plastic, chill.
Wrap in puff pastry: Roll out pastry, brush with egg wash, wrap beef, seal edges, brush with egg wash.
Optional lattice pattern: Create lattice with excess pastry, drape over Wellington, seal, brush with egg wash, sprinkle with flaky salt.
Bake: Preheat oven, bake Wellington until golden brown.
Make sauce (optional): Reduce chicken stock, add butter for a pan sauce.
Serve: Slice Wellington, serve with sauce, mashed potatoes, and vegetables. Enjoy!
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